java 如何将出生日期的用户输入转换为日历单位类型以添加​​到参数化构造函数中？

How would I convert a user input for Date of Birth into a Calendar unit type to add to a parameterized constructor?

提问by darhdevil

Currently in Object-Oriented Programming here. I'm required to prompt a user to input several particulars, including a Date of Birth in the DD/MM/YYYY format. Then, these particulars will be used to construct a Customer object to add to an ArrayList. The Date of Birth must be in a Calendar type to be used to construct a new Customer object.

目前在这里面向对象编程。我需要提示用户输入几个详细信息，包括 DD/MM/YYYY 格式的出生日期。然后，这些细节将用于构造一个 Customer 对象以添加到 ArrayList。出生日期必须是用于构造新客户对象的日历类型。

Thing is, I don't have a lot of idea around Calendar. Here are my questions:

问题是，我对 Calendar 没有太多想法。以下是我的问题：

1. How would I get a user input in a Calendar type?
2. If what I just said is not achievable, what would?
3. How do I prompt the user for a String date and then convert it to a Calendar?

1. 我将如何获得日历类型的用户输入？
2. 如果我刚才说的不能实现，那怎么办？
3. 如何提示用户输入字符串日期，然后将其转换为日历？

I (kinda) know how to use date formatting, though I've no idea how to work around for a user input. Most of the stuffs I found on google and stack overflow doesn't relate to a user input (or it did and I just can't get my head around it). Here's my current code in question:

我（有点）知道如何使用日期格式，但我不知道如何处理用户输入。我在 google 和堆栈溢出上发现的大多数东西都与用户输入无关（或者它确实存在，但我无法理解它）。这是我当前有问题的代码：

Scanner inputReg = new Scanner(System.in);

DateFormat df = new SimpleDateFormat("DD/MM/YYYY"); 

String IC = "";
String name = "";
String date = "";
Calendar dob = Calendar.getInstance();
String tel = "";

System.out.print("Enter Date of Birth (DD/MM/YYYY ): ");
date = inputReg.nextLine();

dob.setTime(date); //and here I'm stuck

System.out.println(dob);

回答by user1428716

This works :

这有效：

DateFormat df = new SimpleDateFormat("d/M/yyyy");
  df.getCalendar().setLenient(false);......

and when you come out of the parsing

当你从解析中出来时

Customer c = new Customer(IC, name, df.getCalendar(), tel);

Complete Code without Name etc

没有名字的完整代码等

Scanner inputReg = new Scanner(System.in);
          **DateFormat df = new SimpleDateFormat("d/M/yyyy");
          df.getCalendar().setLenient(false);**
          System.out.print("Enter Date of Birth (DD/MM/YYYY): ");

          Date theDate = null;
          try {
              String date=inputReg.nextLine();
              System.out.println("date="+date+"@");
            **theDate = df.parse(date);**
        } catch (ParseException e) {
            e.printStackTrace();
        }

       ;
       Calendar dob=df.getCalendar(); // Set this inside Customer
       inputReg.close();

回答by Ofer Lando

What you need is probably something like this:

你需要的可能是这样的：

Scanner inputReg = new Scanner(System.in);
DateFormat df = new SimpleDateFormat("DD/MM/YYYY"); 

String IC = "";
String name = "";
String date = "";
Calendar dob = Calendar.getInstance();
String tel = "";

System.out.print("Enter Date of Birth (DD/MM/YYYY ): ");
date = inputReg.nextLine();

Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy", Locale.getDefault());
cal.setTime(sdf.parse(date));

System.out.println(dob);

回答by JClassic

Here is a version which returns a "date" object.

这是一个返回“日期”对象的版本。

Scanner inputReg = new Scanner(System.in);

    System.out.print("Enter Date of Birth (DD/MM/YYYY): ");

    Date theDate = null;
    try {
        theDate = new SimpleDateFormat("ddMMyyyy").parse(inputReg.nextLine().replaceAll("/", ""));
    } catch (ParseException e) {
        e.printStackTrace();
    }

    System.out.println(theDate);
    inputReg.close();

回答by Vignesh

Try this..hope it helps..

试试这个..希望它有帮助..

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;

public class ToCalender {

    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy", Locale.getDefault());
        try {
            cal.setTime(sdf.parse("18/01/2015"));
        }
        catch (ParseException e) {
            e.printStackTrace();
        }
        System.out.println("dob : " + cal.getTime());
    }

}